Furnace.



E. PEMBERTON.

FURNACE APPLICATION FILED JUNE 8,1914.

Patented Mar. 23, 1915.

2 SHEETS-SHEET 1.

HVVENTUH [7/776/ /%/7z&a/ki/7 W A TTOH/VEY MUTNESSES:

E. PEMBERTON.

FURNACE.

APPLICATION FILED JUNE 8,1914.

Patented Mar. 23, 1915.

2 SHEETS-SHEET 2.

A TTORIV E Y sists' in a furnace that is ELMER PEMBERTON, OF SEATTLE,WASHINGTON. 1

FURNACE.

Specification of Letters Patent.

Patented Mar. 23, 1915.

Application filed Julie 8, 1914. Serial No. 843,615.

To all whom it may concern:

Be it known that I, ELMER PEMBERTON, citizen of the United States,residing at Seattle, in the county of Kings and State of Washington,have invented a certain new and useful Improvement in Furnaces, of whichthe following is a specification.

My invention relates to improvements in furnaces, and the object of myimprovement is to provide a furnace that shall be simple in its plan ofconstruction, efficient and economical in its operation and which shallbe adapted to be'embod'ied in the heating and ventilating system of abuildin I accomplish this object by structures i lustrated in theaccompanying drawings in ,which Figure 1 is a view in vertical section,on broken line B, B of F ig. 2, of a furnace embodying my invention,Fig. 2 is a view of the same in cross-section on broken'li ne A, A ofFig. 1, and Fig. 3 illustrates my invention as embodied in the heatingand 'ventilating system of a building.

In a general way my i rovided with a smoke-pipe in its upper e'n andwith a firebox in its lower end in which fire-box is a grate upon whichfuel may rest, and such furnace is further provided with a plurality ofreturn pipes that communicate with its top portion and thence extenddownwardly on its outside and thence inwardly to terminate at a pointbelow the grate, thus to conduct air and gases from the top portion ofthe furnace and deliver such air and gases at a pointbelow the grate inorder that such air and gases may again pass upwardly throughthe grateto help feed combustion and more nearly consume all smoke. Likereference numerals indicate like parts throughout the drawings.

Referring to Fig. 1, wherein I have shown by a view in vertical sectiona furnace embodying my invention, 5 is an outer casing of such furnaceand (Sis an inner casing or combustion chamber that is disposed'withinthe casing 5 and spaced therefrom to pro vide a passageway 7 for heatedair therebetween, such inner casing 6 being provided near its bottomportion with a fire-box 8 having a grate 9, of common form of con-.

struction, disposed in the bottom, portion thereof.

mprovement con- The inner casing 6 is provided, at a point near its top,with an opening 10 through which it communicates with a smoke pipe 11that extends to and into a flue or chimney? 12 through which smoke andgases may be carried ed, and such casing 6 is further provided with aplurality of pipes 13 that are connected with the upper portion of suchcasing and thence pass downwardly on the outside thereof to a pointbelow the grate 9 and thence upwardly to deliver air into the space l-itimmediately below the grate 9.

The top end of the outer casing 5 is provided with a plurality ofopenings 15 through which it may communicate with a plurality of heatconductingpipes 16 that extend'to various rooms of the building, as moreclearly shown in Fig. 3, such heating pipes 16 preferably beingconnected with heat conducting passageways 17 that are provided in thepartition walls 18 of the building whereby heated air may be conductedupwardly and delivered through; an inlet opening 19 into a room 20 at apoint near its ceiling such heated air then circulating about the room20, as more clearly illustrated by darts in Fig. 1, until it has becomecool and foul and then being drawn out through a return pipe 21 thatcommunicateswith the lower portion of such room near the side oppositeto the inlet 19 and delivered into the space 14 below the grate 9 tobedrawn upwardly through such grate to pass outwardly through the smokepipe 11, the return pipe 21 being directly connected with the smoke pipe11, at a point outside of the furnace by a pipe 22 that is provided witha damper 23 by which the area of the opening of such pipe may beregulated to permit any desired portion of the air that is passingthrough the pipe 21 to pass directly into the smoke pipe 11 instead ofpassing through the furnace and thence into such smoke pipe.

For the purpose of admitting fresh air to the space 7 between thecombustion chamber 6 and the outer casing 5 I have provided airconducting pipes 24 that may extend outwardly through the side of thebuilding to.

a Source of fresh .air.

The operation of my furnace as hereinshown, may be described as follows,it be-, ingunderstood that the principles of operation embodied thereinmay be carried out by devices that differ widely from the devices heroinshown without departing from the spirit of my invention: The furnaceshown in Fig. 1, may be setup in the basement or lower portion of abuilding and connected with the rooms above, as illustrated in Fig. 3,and a fire may be kindled in the firebox 8 of such furnace such firedrawing in air to feed combustion through the pipes 21 that communicatewith the various rooms and such air together with the smoke and gasesmay pass outwardly through the smoke pipe 11 and chimney 12 or it maypass downwardly through the pipes 13 and then again upwardly through thegrate 9 and thence outwardly through such chimney 12. As the fire burns,the air in the passageway 7 becomes heated and rises in the pipes 16andpassageways l7 and issues from the openings 19 into the rooms 20 ofthe building, the pipes'2l, by removing air from such rooms 20, createsa suction in the pipes 16 and passageways 17 and thus tend to aid indrawing the heated air into the rooms 20 to insure a constant change ofair therein and such rooms together with the chimney 12 and the furnaceand pipes connected therewith from a continuous passageway wherebyfresh, pure air may. constantly be drawn through the pipes a into andthrough the passageway 7 where it warmed, thence through the pipes 16and passageways 17 into the rooms 20to warm and ventilate such rooms 20and thencethrough the pipe 21 into the furnace to feed combustion andthence out of the chimney-12, such chimney 12 acting as ,a siphon todraw air constantly through the furnace and through the rooms and thepipes connected therewith. The suction due to the draft of the chimneyis exerted with equal force at the top and bottom end'of each of thepipes 13 and such pipes are located on the outside of the combustionchamber 6, as more clearly shown in Fig. 1,

so that the air contained therein is slightly cooler than the air in thecombustion chamber 6 and tends to settle and pass out through thelowermost end of suchpipes 13 thus creating a constant return flow ofheated air from the top of the furnace to a point below the grate 9which heated air, and the combustible gases that it carries with it,materially aids in the combustion of the fuel upon the grate 9 andcauses such fuel to burn up much more clearly than it would if I suchpipes were not present. When the arrangement of pipes shown in Fig. 3,is used in connection with my im proved form of furnace, the temperatureof the rooms 20 serves automatically to regulate the draft through thefurnace, the air in such rooms settling faster through the pipes 21 andcreating a stronger draft as it becomes warmer, there being providedbetween each pipe 21 and the smoke pipe 11,

a by-pass formed by the pipe 22 that is adapted to be opened or closedby a damper 23 whereby-if the fire lll'tlle furnace burns too fast thedraft through the pipes 21 may be reduced by opening such dampersufliciently to permit a portion of the air passing through the pipes 21to flow directly intothe smoke pipe 11. Even though there is no fire inthe furnace the structure shown in Fig. 3, will act as a ventilator forthe rooms 20, the air following the same course as it would if therewere a fire in the furnace.

\Vhile I have illustrated my invention as applied to a furnace forheating a building it is obvious that passageways equivalent to thepipes 13 and adapted to perform the samefunction as the pipes 13 may beapplied to any other kind of furnace or generator of heat and manychanges may be made in the shape and form of various parts embodied inmy device Without departing from the spirit of my invention orsacrificin any of its advantages. 7

' at I claim is: i

1. In a furnace of the class described, the combination with a casing,ofa grate pro-' vided in said casing to form a combustion chamber in theupper portion and an air chamber in the lower portion thereof, pipesprovided on the outside of said casing, said pipes being connected tothe top portion of said combustion chamber and with said products ofcombustion chamber whereby air may flow therethrough, and other pipes.disposed to conduct air into said air chamber.

2. In a furnace of the class described, the combination with an innercasing having a grate provided therein and disposed to form a combustionchamber in the upper portion and an air-chamber in the lower portion ofsuch casing, of an outer casing disposed to surround said inner casingand spaced therefrom, pipes disposed in the space between said twocasings and connecting the top portion of said combustion chamber withsaid air chamber to convey products of combustion thereto, heatconducting pipes connected with the top portion of said outer casing,and air pipes to deliver fresh air to said air chamber.

3. In a furnace of the class described, the combination with an innercasing having a grate provided therein to form a combustion chamber inthe upper portion and an air chamber in the lower portion thereof, of asmoke pipe connected with the upper portion of said inner casing. airpipes connect ed with the upperportion of said casing and disposed topass downwardly along the outside of said casing to connect with saidcasing at a point below said grate to convey products of combustionthereto, an outer casing disposed about said inner casing and said airpipes, heat conducting pipes rounected with the top portion of saidouter casing, and outside air pipes for admitting fresh air to the lowerportion of said outer casing.

ELMER PEMBERTON.

Witnesses A. HASKINS, FRANK WARREN.

